GEOG 1101 Lecture Notes - Lecture 10: Supercooling, Supersaturation, Tor Bergeron

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GEOG LESSON 10
DEW is water that has condensed onto objects near the ground when their Tºs
have fallen below the d.p.Tº of the surface air. In winter, however, this may
form solid forms of dew.
Frozen Dew refers to dew (in the liquid state) which has formed and then freezes (to the solid state).
water vapor to liquid to solid)
* Condensation occurs at a Tº above the freezing point, then the
temperature continues to drop below the freezing point & the dew
freezes. Condensation then freezing.
Frost or Hoarfrost is a covering of ice produced by deposition because the d.p.T is below freezing
* Water vapor changes directly to the solid state.
PRECIPITATION PROCESSES
** Simplified process:
Rain: Water vapor condenses into liquid water droplets forming clouds.
These droplets coalesce (join together) and become heavy enough to be
pulled down by gravity as precipitation (a raindrop), if they do not
evaporate before they hit the ground.
H2OV ---------------------> liquid water ----------------------------> precip
(Clouds)
* Cloud droplet average size is about 20 microns in diameter & fall
very slowly, about 1000 m/48 hrs. Thus they usually evaporate.
* 1 raindrop = about 1 million cloud droplets, so cloud droplets must
coalesce or join together into a raindrop to avoid evaporation.
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